This is a simple renaming without adaptation.

* web, website, mass_mailing

Before this commit, the editor allowed defining the margin of some
elements and the height of some elements. There were three main
problems with this system:

1) When an user dragged the arrow, he often expected to change the
   size of the element while he was in fact changing the margin

2) When changing the margin, you increase the space between two
   elements but with a white space (while most users want a space
   with the same color of the block they are resizing = padding)

3) When changing the height, the user was able to hide snippet parts
   and the height was not consistent accross screen sizes

Now, the only thing you can edit is padding. There is only one arrow
for each direction, which allows increasing spacing and consistent
dimension at the same time.
The only feature that is lost with this change is the ability to
control vertical alignement of colored columns. This is not a problem
as colored columns are rare in our current snippets and there still
have the possibility to add margin classes by hand if necessary (there
are also plans to control vertical alignement another way).

Note: margin classes are kept for compatibility.

website.page = old ir.ui.view with page=True
website.redirect is a new mechanism to replace in the futur the ir.attachment
mechanism of redirect.

From now, we don't have a specific /page controller to serve 'page'.

We use a new model website.page which is rendered if none route matches the url
 and that the field 'url' on website.page matches the request.httprequest.path.

The order to serve a path is:
    - Routes defines in controllers (/shop, /blog, ...)
    - ir.attachment with name matching the path
    - website.page with url matching the path
    - website.redirect with url_from matching the path
    - 404

To improve:
    - allow regexp in website.redirect model
    - allow to edit the view_arch from the page.management via redirect backend
      (needed when traceback in the page, or when modifying a js/css/less/...)

This commit comments some LESS files to help the user to understand
for what their content is used (preparing the LESS editor feature).

Commit 3c9e6c89e7207636c1bdab4ed8118c0c1089d43e made big changes
to the link dialog.

This commit fixes two bugs it introduced:
* The color class preview was not properly set when opening a dialog
  (so changing nothing and saving would change the result)
* New btn color classes were wrongly initialized. It did not use less
  generation and made the button text always white. This could
  introduce bugs when using different colors in themes.

Note: this code is already being refactored anyway.

Specification
=============

- no boxes around fields
- use regular form style for input fields
- don't split page/URL into two fields, just do one URL field, with autocomplete
- Add alpha, beta, gamma, delta and epsilon color in color selection because they are used in mass mailing and themes also.
- Add a selection option with label "L" inside circle for link.
- Add Color selector for choosing button color
- Remov select2 page selector and used jquery autocomplete on same input
- Fix issue of page search in ir.http